Energy saving device for walk-in refrigerators and freezers

a technology for walk-in refrigerators and freezers, which is applied in the direction of lighting and heating apparatus, heating types, domestic cooling apparatus, etc., can solve the problems of inherent delay in the change of temperature associated with the expansion valv
US6397612B1Inactive Publication Date: 2002-06-04ADRIEL ENERGY
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
ADRIEL ENERGY
Publication Date
2002-06-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

An energy saving apparatus for use with a heat exchange system having a cooled chamber, a compressor, a condenser, an evaporator, an evaporator fan, and refrigerant within refrigerant carrying lines has an evaporator fan controller for monitoring operational status of the system (cooling or non-cooling) and setting an energy saving operational speed for the evaporator fan based on the operational status of the system (cooling or non-cooling) and a current sensor coupled to the evaporator fan controller for detecting the operational status of the system (cooling or non-cooling). If the system is detected as cooling, the evaporator fan controller directs the evaporator fan to operate at a high speed and if the system is detected as not cooling (non-cooling), the evaporator fan controller decreases the operational speed of the evaporator fan to a low speed, thereby decreasing evaporator fan produced heat, resulting in an overall decreased energy requirement for the heat exchange system.
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Description

1. Field of the InventionAn evaporator fan controller is provided to lower energy use in a heat exchange system. More specifically, an evaporator fan controller, for initial installation or retrofit, monitors the cooling cycle of a refrigeration system and adjusts the operation of an associate fan to maximize energy efficiency.2. Description of the Background ArtCompressor-associated refrigeration systems function by removing heat from a desired location, thereby cooling that location. For example, in a walk-in type refrigerator, often, more than 30% of the heat found in the location to be cooled is actually generated by fan motors within the refrigeration system itself. A typical walk-in refrigerator may have an evaporator coil fitted with five motors of standard configuration. If these motors are rated at a typical value of 1 / 20 hp each, their combined heat output would be approximately 11,675 Btu / hr, at normal operating voltage. Clearly, if this amount of system generated heat co...

Claims

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